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Combines & Harvesters Discussion Forum

Re: 1660 broke drive axle

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Jon Hagen

10-30-2012 18:11:14

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Have been down that road a couple times with our even heavier 1480 combines. The final drive cases are weak so they spread and do not hold proper preload on the wheel bearings, shortning their life.
also the early axle designs were weak, the 2 piese axle / flange assys with 1 or 3 retaining bolts were especially bad while the latter 1 piece (rough back) axlees were better, but still cracked off at the flange.

the replacement (smooth back) axle shafts have more metal inthe transition from axle to flange and are much stronger. I have never had a smooth back axle fail.

In a discussion of this problem on another site, I addressed this problem and posted pictures that explain the problem and the fix.

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Jon Hagen

10-30-2012 18:32:20

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 Re: 1660 broke drive axle in reply to Jon Hagen, 10-30-2012 18:11:14  
The really first big upgrade of the AF final drives happened with the 21XX series, when they became very strong.

Earlier, they did small upgrades, but did not reall get it fixed untill the much heavier drives on the 21 series. Putting 21 series final drives on a 14 or 16 series combine is a popular upgrade if you can find them.

The drive cases were strengthened several times with added ribbing, plus the sheetmetal case covers were replaced with much more rigid cast iron covers which helped the case spreading problem and extended wheel bearing life. The shaft breakage problem was pretty well eliminated with the stronger "smooth back" axle shafts.

One tip, ANY axle seal leakage means a 99% chance that the outer wheel bearing is failing and needs to be fixed RIGHT NOW. Continuing on can turn a $300 bearing replacement into a $2500 destroyed final drive disaster.

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